noun
tear-gas bomb
A canister or projectile that releases tear gas, used for riot control or military purposes.
警察はデモ隊に向けて催涙弾を発射した。
The police fired tear-gas bombs at the demonstrators.
催涙ガス refers to tear gas itself, while 催涙弾 is the bomb or canister that disperses it.
Compound of 催涙 (tear-inducing) and 弾 (bomb, projectile).